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@Dammit
I've cured the "fan staying on" issue- changing the wiring so that the switched live no longer shares a connection with the lighting circuit (and it's transformers) stops the problem.
Looks like the lighting SELV transformers, when not in use, are putting out a voltage that is high enough to trigger the fan.
I've now got a dual switch on the wall by the ensuite door, you can turn on just the light (2am visit) or light and fan.